The moving party shall give notice as described by section 1‑401 of the moving party's intention to seek an appointment informally to:
1. Person demanding notice. Any person demanding notice pursuant to section 3‑204;
2. Heir or devisee. An heir or devisee who has not waived notice in writing and filed with the court; and
3. Person having right to appointment. Any person having a prior or equal right to appointment not waived in writing and filed with the court.
If the decedent was 55 years of age or older, the moving party shall give notice as described in section 1‑401 to the Department of Health and Human Services. No other notice of an informal appointment proceeding is required.